Why do all polypeptide chains start with methionine?
Because the nucleotide that codes for methionine also is the "start" signal, so whenever a polypeptide starts it uses the exact same code (AUG) so methionine must start every
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Will methionine give a positive Biuret test?
The Biuret test will give a positive for peptide bonds. Methionine is a free amino acid and does not have peptide bonds.